since we are living in gravitational field generated by Earth, upwarding plume is generated due to density
difference coming from temperature difference between air around human body
and environmental air.
|For air: from
32F to 100F: is 0.1234
|For water from
32F to 100F: is 0.0064.
|That is, in the
air, buoyant force are 20 times stronger than that in the water per unit
|Look at the
plume generated: 1. It acts as mechanism of transfer between lower region and upper regions. 2. Due to entrainment, as it goes up,
volumetric flow rate increases.
| However, since it is open space, it is not
likely that the hotter and contaminated air is not going to return to him